Github user jacek-lewandowski commented on the pull request:
https://github.com/apache/spark/pull/4220#issuecomment-72274441
It serializes the object and then deserializes so I suppose this is a deep
copy.
For the `stringPropertyNames` - you can, but this will not be a 1:1 copy:
```scala
val parent = new Properties()
parent.setProperty("test1", "A")
val child = new Properties(parent)
child.put("test1", "C")
child.put("test2", "B")
child.getProperty("test1")
child.remove("test1")
child.getProperty("test1")
```
will give you
```
scala> res17: Object = C
scala> res18: String = A
```
When you copy in the way you suggested, there will be `null` after removal.
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